An elastic attachment adhesive and a disposable absorbent article made with the same

ABSTRACT

The invention relates to a disposable absorbent article and an adhesive composition including a first polymer that is propylene-based and has a Mw of no greater than about 75,000, and a second polymer selected from a group including propylene based polymers with a Mw of at least about 100,000 and styrene block copolymers with a styrene content of no greater than about 20% where the adhesive composition is useful for elastic attachment applications.

This patent claims the benefit of or priorty to U.S. provisionalapplication 61/828,453 and U.S. provisional application 61/828,468 bothfiled on May 29, 2013.

BACKGROUND

Adhesives are often used to bond substrates together so as to maintainthe two substrates in a fixed relation to each other. In the area ofindustrial adhesives, hot melt adhesives are commonly used to bondtogether a wide variety of articles including disposable absorbentarticles comprising non-woven substrates e.g. adult incontinenceproducts, disposable diapers, sanitary napkins, bed pads, puppy pads,medical dressings, etc.

There can be multiple hot melt adhesives used in the manufacture of adisposable absorbent article. For example, in the manufacture of adisposable diaper, adhesives are used in construction (e.g. bonding thebacksheet to the nonwoven and optionally the absorbent pad), elasticattachment (e.g. bonding the elastic material to the backsheet in forexample the leg or waist area), and for the core stabilization (e.g.applying an adhesive to the absorbent core to increase the strength ofthe core).

SUMMARY

In one aspect, the invention features a disposable absorbent articleselected from the group consisting of an adult incontinence product anda diaper including a first substrate and an elastic material; and anadhesive composition including a first polymer that is propylene-basedand has a Mw of no greater than about 75,000 and a second polymerselected from a group consisting of propylene based polymers with a Mwof at least about 100,000 and styrene block copolymers with a styrenecontent of no greater than about 20%, where the propylene-based polymershave a polydispersity index of less than about 5 and where the adhesivecomposition is in contact with the elastic material and the firstsubstrate.

In one embodiment, the adhesive composition also is applied in at leastone additional application selected from the group consisting of corestabilization and construction. In another embodiment, the adhesivecomposition also is applied as a core stabilization adhesive andconstruction adhesive.

In one embodiment, the adhesive composition comprises no greater thanabout 20% by weight plasticizer; alternately the adhesive compositioncomprises no greater than about 18% by weight plasticizer.

In one embodiment, the second polymer is present at from about 2% toabout 15% by weight; alternately the said second polymer has an Mw of atleast about 150,000.

In one embodiment, the first polymer is a propylene homopolymer;alternately the first polymer is a propylene copolymer. In anotherembodiment, the first polymer is present at greater than about 25% byweight.

In one embodiment, the second polymer is a hydrogenated styrene blockcopolymer. In another embodiment, styrene block copolymer additionallyhas a Melt Flow when tested according to ASTM 1238 (230° C., 5 kg) of nogreater than about 5 g/10 min. Alternately, the second polymer is apropylene-based polymer. In another embodiment, the adhesive compositioncomprises at least about 35% total polymer.

In another embodiment, the disposable absorbent article is selected fromthe group including an adult incontinence product and a diaper;alternately the disposable absorbent article is a diaper. In anotherembodiment, the adhesive composition bonds the elastic material to thefirst substrate resulting in creep resistant gathers.

In a different aspect, the invention features a hot melt adhesivecomposition including a first polymer that is propylene-based and has aMw of no greater than about 75,000 and a polydispersity index of lessthan about 5 and; a second polymer that is a hydrogenated styrene

block copolymer with a styrene content of no greater than about 20%, anda Melt Flow when tested according to ASTM 1238 (230° C., 5 kg) of nogreater than about 25 g/10 min and wherein the adhesive compositioncontains no greater than 18% by weight plasticizer.

In one embodiment, the hot melt adhesive composition has a total polymercontent is at least about 35% by weight. In another embodiment, the hotmelt adhesive has a creep of no greater than about 6% when testedaccording to the Elastic Attachment Creep Test.

GLOSSARY

In reference to the invention, these terms have the meanings set forthbelow: Propylene-based refers to a polymer that comprises at least about50% by weight propylene.

DETAILED DESCRIPTION

The inventors have discovered that certain adhesive compositions havesuperior shear properties, low odor and good thermal stability. Theseproperties make the adhesive composition useful for elastic attachmentand at least one additional adhesive application in the manufacture of adisposable absorbent article selected from the group consisting of anadult incontinence article and a diaper.

Disposable Absorbent Article

The disposable absorbent article includes a nonwoven substrate and anadhesive composition. The adhesive composition is used for elasticattachment (e.g.bonding the elastic material to the backsheet in forexample the leg or waist area) in the nonwoven article.

The disposable absorbent article can be selected from the groupconsisting of adult incontinence products, disposable diapers, sanitarynapkins, bed pads, puppy pads, medical dressings and surgical gowns.

The adhesive can be used for at least one additional application in thedisposable absorbent article. Possible additional applications includeconstruction (e.g.bonding the backsheet to the nonwoven and optionally,the absorbent pad) and core stabilization (e.g. applying an adhesive tothe absorbent core to increase the strength of the core).

Adhesive Composition

The adhesive composition is a hot melt adhesive. The adhesive can be apressure sensitive adhesive. The adhesive composition can be light incolor and can have good thermal stability. The adhesive can have anInitial Gardner Color after manufacturing of less than about 3, or evenless than about 2. The adhesive has a viscosity change of no more thanabout 20%, no more than about 15%, or even no more than about 10% whentested according to the Thermal Stability Test Method. The light colorand good thermal stability make it possible to hold the adhesive in amolten bulk tank until it is needed for use.

The adhesive composition has a static peel when tested according to theStatic Peel Test that is greatly improved versus prior art olefin basedhot melt adhesives currently on the market (NW1137 available from HBFuller Company is used as a control). The Static Peel can be 15% greaterthan the static peel of NW1137, 20% greater than the static peel ofNW1137, or even 50% greater than the static peel of NW1137.

The adhesive composition has a static peel when tested according to theStatic Peel Test of no less than about 65 seconds, no less than about 75seconds, no less than about 100 seconds, or even from about 75 secondsto about 225 seconds.

The adhesive composition has a creep when tested according to theElastic Attachment Creep Test of no greater than about 8%, or even nogreater than about 6%, or even no greater than about 5%.

The adhesive composition has low viscosity at application temperature.The viscosity can be no greater than about 10,000 cps at around 150° C.,or even no greater than about 8,000 cps at around 150° C.

The light color, low viscosity and good shear properties make itpossible to use the adhesive for elastic attachment in the manufactureof a disposable absorbent article.

Polymer

The adhesive composition includes at least two different polymers.Useful propylene-based polymers for the first and/or second polymerinclude propylene homopolymers. Alternately, one or more of the twodifferent propylene-based polymers can be copolymers of propylene withone or more other monomers (e.g. ethylene, butene, pentene, octene,etc.). The propylene-based polymers can be based entirely on olefins,i.e. do not contain any functional groups. The propylene-based polymerscan comprise greater than 75% by weight propylene or even greater than80% by weight propylene. The propylene-based polymers can have apolydispersity (Mw/Mn) of less than about 5, less than about 3, or evenabout 2. Useful propylene-based polymers can have a density of nogreater than about 0.90, no greater than about 0.89, or even no greaterthan about 0.88. Useful propylene-based polymers include single-site(e.g.metallocene) catalyzed propylene-based polymers.

The first polymer is a propylene-based polymer. The first polymer canhave a molecular weight (Mw) of less than about 75,000, less than about60,000, less than about 50,000 or even between about 30,000 and about70,000. The first polymer can be present in the adhesive composition atno less than about 20% by weight, no less than about 25% by weight, noless than about 30% by weight, from about 15% to about 50% by weight, oreven from about 25% to about 45% by weight. Useful commerciallyavailable first polymers include LICOCENE PP 1602 and LICOCENE PP2602both available from Clariant International Ltd. (Muttenz, Switzerland)and L-MODU X400S and L-MODU X600S available from Idemitsu Kosan Co.,Ltd. (Japan).

The second polymer is selected from the group consisting ofpropylene-based polymers and styrenic block copolymers.

The second polymer can be a propylene-based polymer. The propylene-basedpolymer can have a molecular weight (Mw) of at least about 100,000, atleast about 125,000, at least about 150,000, between about 125,000 andabout 400,000, or even between about 150,000 and 250,000. The secondpolymer can be present in the composition at no greater than about 20%,no greater than about 15% by weight, or even between about 2% by weightand about 15% by weight. Useful commercially available second polymers,that are propylene-based polymers include VISTAMAXX 6202 and VISTAMAXX6102 available from ExxonMobil Chemical (Houston, Tex.) and VERSIFY 3300available from Dow Chemical Company (Houston, Tex.).

The second polymer can be a styrene block copolymer. The styrene blockcopolymer can be hydrogenated. Useful hydrogenated styrene blockcopolymers include, e.g., styrene-ethylene/butadiene-styrene blockcopolymer, styrene-ethylene/propylene-styrene block copolymer,styrene-ethylene/ethylene/propylene-styrene block copolymer, andcombinations thereof.

The styrenic block copolymer can have a styrene content of no greaterthan about 20% by weight, no greater than about 18% by weight, or evenno greater than about 15% by weight. The styrene block copolymer canalso have a Melt Flow when tested according to ASTM 1238 (230° C., 5 kg)of less than about 25 g/10 min, less than about 20 g/10 min, less thanabout 10g/10 min, or even less than about 5 g/10min.

Suitable hydrogenated styrene block copolymers are commerciallyavailable under a variety of trade designations including, e.g., theSEPTON series of trade designations from Kuraray Co. Ltd (Houston, Tex.)including, e.g., SEPTON S2063 and S2007 hydrogenatedstyrene-isoprene-styrene block copolymers, the KRATON G series of tradedesignations from Kraton Performance Polymers Inc. (Houston, Tex.)including, e.g., KRATON G 1645M, KRATON G 1657styrene-ethylene/butdiene-styrene block copolymers.

The adhesive composition can include no greater than about 20% byweight, no greater than about 15% by weight, between about 2% and 20% byweight, or even between about 5% and 15% by weight of the styrenic blockcopolymer.

The adhesive composition can include two second polymers i.e. onepropylene-based polymer and one styrene block copolymer.

The first polymer is lower in molecular weight than the second polymer.

The total polymer content of the adhesive can be at least about 20% byweight, at least about 25% by weight, at least about 30% by weight, atleast about 35% by weight, or even from about 35% by weight to about 50%by weight.

Plasticizer

The adhesive composition can include a plasticizer. The plasticizer canbe saturated (e.g. mineral oil, paraffinic oil, etc.) in order toimprove heat stability for bulk handling. Suitable plasticizers include,e.g., naphthenic oils, paraffinic oils (e.g., cycloparaffin oils),mineral oils, phthalate esters, adipate esters, olefin oligomers (e.g.,oligomers of polypropylene, polybutene, and hydrogenated polyisoprene),polybutenes, polyisoprene, hydrogenated polyisoprene, polybutadiene,benzoate esters, animal oil, plant oils (e.g. castor oil, soybean oil),derivatives of oils, glycerol esters of fatty acids, polyesters,polyethers, lactic acid derivatives and combinations thereof.

Useful commercially available plasticizers include CALSOL 550 oil fromCalumet Specialty Products Partners, LP (Indianapolis, Ind.), KAYDOL OILfrom Sonneborn (Tarrytown N.Y.) PARAPOL polybutene from Exxon MobilChemical Company (Houston, Tex.), OPPANOL polyisobutylene from BASF(Ludwigsjhafen, Germany), KRYSTOL 550 mineral oil from Petrochem CarlessLimited (Surrey, England) and PURETOL 15 mineral oil from Petro CanadaLubricants Inc. (Mississauga, Ontario).

The plasticizer is present in the adhesive composition at no greaterthan about 25% by weight, no greater than about 20% by weight, nogreater than about 18% by weight, between about 5% and about 30% byweight, between about 5% and about 20% by weight, or even between about10% by weight and about 18% by weight.

Tackifying Agent

The adhesive can include a tackifying agent. The tackifying agent can beat least partially hydrogenated in order to improved stability for bulkhandling. The tackifying agent can be fluid or solid at roomtemperature. Suitable classes of tackifying agents include, e.g.,aromatic, aliphatic and cycloaliphatic hydrocarbon resins, mixedaromatic and aliphatic modified hydrocarbon resins, aromatic modifiedaliphatic hydrocarbon resins, and hydrogenated versions thereof;terpenes, modified terpenes and hydrogenated versions thereof; naturalrosins, modified rosins, rosin esters, and hydrogenated versionsthereof; low molecular weight polylactic acid; and combinations thereof.Examples of useful natural and modified rosins include gum rosin, woodrosin, tall oil rosin, distilled rosin, hydrogenated rosin, dimerizedrosin and polymerized rosin. Examples of useful rosin esters includee.g., glycerol esters of pale wood rosin, glycerol esters ofhydrogenated rosin, glycerol esters of polymerized rosin,pentaerythritol esters of natural and modified rosins includingpentaerythritol esters of pale wood rosin, pentaerythritol esters ofhydrogenated rosin, pentaerythritol esters of tall oil rosin, andphenolic-modified pentaerythritol esters of rosin.

Useful tackifying agents are commercially available under a variety oftrade designations including, e.g., the ESCOREZ series of tradedesignations from Exxon Mobil Chemical Company (Houston, Tex.) includingESCOREZ 5400 and ESCOREZ 5600, the EASTOTAC series of trade designationsfrom Eastman Chemical (Kingsport, Tenn.) including EASTOTAC H-100R andEASTOTAC H-100L and the WINGTACK series of trade designations from CrayValley HSC (Exton, Pa.) including WINGTACK 86, WINGTACK EXTRA, andWINGTACK 95 and the PICCOTAC and KRISTALEX series of trade designationsfrom Eastman Chemical Company (Kingsport, Tenn.) including, e.g.,PICCOTAC 8095 and KRISTALEX 3100.

The adhesive composition can include at least about 10% by weight, atleast about 20% by weight, from about 5% by weight to about 60% byweight, from about 10% by weight to about 50% by weight, or even fromabout 10% by weight to about 40% by weight tackifying agent.

Wax

The adhesive composition can include a wax. Useful classes of waxinclude, e.g., paraffin waxes, microcrystalline waxes, high density lowmolecular weight polyethylene waxes, by-product polyethylene waxes,polypropylene waxes, Fischer-Tropsch waxes, oxidized Fischer-Tropschwaxes, functionalized waxes such as acid, anhydride, and hydroxymodified waxes, animal waxes, vegetable waxes (e.g. soy wax) andcombinations thereof Useful waxes are solid at room temperature andpreferably have a Ring and Ball softening point of from 50° C. to 170°C. Useful waxes are commercially available from a variety of suppliersincluding EPOLENE N and C series of trade designations from WestlakeChemical Corporation (Houston, Tex.) including e.g. EPOLENE N-21 and theLICOCENE series of trade designations from Clariant International Ltd.(Muttenz, Switzerland) including e.g. TP LICOCENE PP 6102.

The adhesive composition can include no greater than about 10% byweight, no greater than about 5% by weight, from about 1% by weight toabout 10% by weight, from about 1% by weight to about 5% by weight wax,or even from about 1% by weight to about 3% by weight wax.

Additional Components

The adhesive composition optionally includes additional componentsincluding, e.g., stabilizers, antioxidants, additional polymers (e.g.styrenic block copolymers, amorphous poly-alpha olefins, polyethylenecopolymers), adhesion promoters, ultraviolet light stabilizers,corrosion inhibitors, colorants (e.g., pigments and dyes), fillers,surfactants, wetness indicators, superabsorbents and combinationsthereof.

Useful antioxidants include, e.g., pentaerythritol tetrakis[3,(3,5-di-tert-butyl-4hydroxyphenyl)propionate], 2,2′-methylenebis(4-methyl-6-tert-butylphenol), phosphites including, e.g.,tris-(p-nonylphenyl)-phosphite (TNPP) and bis(2,4-di-tert-butylphenyl)4,4′-diphenylene-diphosphonite, di-stearyl-3,3′-thiodipropionate (DSTDP),and combinations thereof. Useful antioxidants are commercially availableunder a variety of trade designations including, e.g., the IRGANOXseries of trade designations including, e.g., IRGANOX 1010, IRGANOX 565,and IRGANOX 1076 hindered phenolic antioxidants and IRGAFOS 168phosphite antioxidant, all of which are available from BASF Corporation(Florham Park, N.J.), and ETHYL 702 4,4′-methylenebis(2,6-di-tert-butylphenol). When present, the adhesive compositionpreferably includes from about 0.1% by weight to about 2% by weightantioxidant.

Disposable Absorbent Article

The adhesive composition can be applied to (i.e. such that it is indirect contact with) or incorporated in a variety of substratesincluding, e.g., films (e.g., polyolefin (e.g., polyethylene andpolypropylene) films), release liners, porous substrates, cellulosesubstrates, sheets (e.g., paper, and fiber sheets), paper products,woven and nonwoven webs, fibers (e.g., synthetic polymer fibers andcellulose fibers) and tape backings.

The adhesive composition is also useful in a variety of applications andconstructions including, e.g., disposable absorbent articles including,e.g., disposable diapers, adult incontinence products, sanitary napkins,medical dressings (e.g., wound care products) bandages, surgical pads,pet training pads (e.g. puppy pads) and meat-packing products andcomponents of absorbent articles including, e.g., an absorbent element,absorbent cores, impermeable layers (e.g., backsheets), tissue (e.g.,wrapping tissue), acquisition layers and woven and nonwoven web layers(e.g., top sheets, absorbent tissue) and elastics.

The adhesive composition is useful on substrates made from a variety offibers including, e.g., natural cellulose fibers such as wood pulp,cotton, silk and wool; synthetic fibers such as nylon, rayon,polyesters, acrylics, polypropylenes, polyethylene, polyvinyl chloride,polyurethane, and glass; recycled fibers, and various combinationsthereof.

Various application techniques can be used to apply the composition to asubstrate including, e.g., slot coating, spraying including, e.g.,spiral spraying and random spraying, screen printing, foaming, engravedroller, extrusion and meltblown application techniques.

Methods of Making a Disposable Absorbent Article

The adhesive composition is thermally stable, low in viscosity and hasgood heat resistance in a shear mode. These properties make it usefulfor multiple applications in the construction of a disposable absorbentarticle.

The adhesive is used for elastic attachment applications, which includebonding elastic material to either the leg and/or waist area. Theelastic material can be bonded to polyethylene, polypropylene ornonwoven substrates to result in creep resistant gathers.

The adhesive can also be used for construction applications. In atypical construction application in the manufacture of a disposableabsorbent article, a body fluid impermeable backsheet is bonded to anonwoven substrate. The adhesive may also be used to bond at least oneadditional layer or material selected from the group consisting ofabsorbents, tissues, elastomeric materials, superabsorbent polymers, andcombinations thereof. The body fluid impermeable backsheet is typicallya polyolefin film (e.g. polyethylene, polypropylene, ethylene vinylacetate, ethylene copolymer, etc.).

The adhesive can be used to contain and/or provide strength to theabsorbent core of a disposable absorbent article (i.e. as a corestabilization adhesive). The absorbent core can include many differentmaterials including natural cellulose fibers (e.g. wood pulp, fibers,cotton, fluff, etc.) and superabsorbent polymers (e.g.polyacrylates). Insome disposable absorbent articles, the absorbent core is substantiallycellulose free. In a cellulose free core, the absorbent core consists ofadhesive and superabsorbent polymer.

The invention will now be described by way of the following examples.All parts, ratios, percents and amounts stated in the Examples are byweight unless otherwise specified.

EXAMPLES Test Procedures

Test procedures used in the examples and throughout the specification,unless stated otherwise, include the following.

Viscosity Test Method

Viscosity is determined in accordance with ASTM D-3236 entitled,“Standard Test Method for Apparent viscosity of Adhesives and CoatingMaterials,” (Oct. 31, 1988), using a Brookfield Thermosel viscometerModel RVDV 2 and a number 27 spindle. The results are reported incentipoise (cps).

Thermal Stability

A hot melt composition is held at 300° F. (149° C.) for periods of 24hours, 48 hours, 72 hours, and 96 hours. Viscosity and/or Molten GardnerColor of the aliquots can then be tested. Thermal stability is recordedas the change in viscosity over 96 hours and is calculated as a percentchange according to the following formula:

((final viscosity-initial viscosity)/initial viscosity)*100

Molten Gardner Color

The adhesive is tested (in the molten state) to determine Gardner colorby comparing the color of the sample against the Gardner Color Standardsas set forth in ASTM D-1544. The comparison is made using a GardnerDelta Comparator equipped with an Illuminator available from PacificScientific (Bethesda, Md.).

Static Peel Test

Adjust hot melt applicator and laminator to recommended settings for thedesired adhesive. The goal is to make an application of a uniformadhesive spiral measuring a width of approximately 12.7 mm (0.5 inches).Adjustments can be made based on the type of adhesive or application.The adhesive was applied to the treated side of a polyethylene film(DH-284 PE White available from Clopay Plastic Products Company,Augusta, Ky.) at a coat weight of 6.0 gram/m² and nipped to the nonwoven(UNIPRO 45 available from Midwest Filtration Company, Cincinnati, Ohio)substrate.

Bonds are made with the test adhesive/s and NW1137 as a control.

Once the pattern width and desired adhesive coat weight has beenachieved run several feet of material then insert sheets of paper in tonip to make the sample starting points (about 10 paper sheets), takecare to insert the paper 90° square to the lamination this will insure astraight bond line to start the peel. Leave each of the adhesivelaminations on the roll until they are ready to be tested, inapproximately 24 hrs.

Unroll the samples and cut test coupons 100 mm long in the machinedirection 50 mm of paper tag to start the peel and 50 mm of bondedsubstrate. Then cut the test coupons 40 mm wide in the cross-machine,with the middle spiral in the center. When cutting the test coupons besure to cut the coupons in such a way as to maintain a straight andsquare line at the test start point. Prepare 3 samples. Roll and staplethe tag end of the unbonded poly film then roll and staple the tag endof the unbonded nonwoven. This will allow a secure place to hold thetest samples in place during the static peel.

Place the test coupons and the 100 g test weights in a 37° C. oven forat least 30 min to equilibrate. To begin the test attached the poly filmend of the test coupon to the top of the rack in the oven and thencarefully attach the 100 g weight to the nonwoven end of the test samplewhen the weight is released start the timer, stop the timer when thepoly and nonwoven are completely separated and the weight falls. Repeatthe test alternating between the control adhesive and the test adhesiveuntil at least 3 replicates of each adhesive have been tested.

Report the average time to failure of the test sample/s and NW1137 inseconds, plus any additional descriptive and pertinent information suchas substrate failure or any variations in the application or testmethod.

Elastic Attachment Creep Test

The hot melt adhesive is applied in molten form to LYCRA 689 dtexstrands (pre-stretched to 240%) using a Nordson SURE WRAP nozzle, anapplication temperature of 140° C. and a coat weight of 0.15 g/linearmeter. The adhesive coated pre-stretched elastic was then laminatedbetween a polypropylene based nonwoven (VS26-26 g/m²) and a polyethyleneback sheet (Article No. 30163544 available from Hutamaki).

The elastic contracts creating gathers when released from the roll. 14cms was removed from roll, stretched 100%, and stapled to corrugatedboard. The corrugated board was aged for 2 hours at 40° C. Elastic creepis reported as a percent and is measured by estimating the portion ofthe bond in which the elastic pulls away (or creeps) from thesubstrates.

TABLE 1 Polymer Properties VISTA- L-MODU L-MODU LICOCENE MAXX VERSIFYKRATON X400S X600S PP1602 6202 2300 G-1645M Supplier Idemitsu IdemitsuClariant Exxon Dow Kraton Kosan Kosan Co., Mobil Chemical Polymers Co.,Ltd. LTd. Chem. Co. Company U.S. LLC Polymer Type PP Homo- PP Homo-PP/PE PP/PE PP/PE SEBS Polymer Polymer copolymer Copolymer copolymerEthylene content 0 0 15 (wt %) Styrene content 12.5 (wt %) Mw 45,00070,000 47,600 184,000 Mw/Mn 2 2 4.6 2.1 2-3 Mass Flow Rate 18 (230° C.,2.0 (230° C., 3.25(230° C., (g/10 min) 2.16 kg) 2.16 kg) 2.16 kg)Density .87 .87 .87 .861 .867

TABLE 2 Examples Example Example Example Example Example Comp. 1* Comp.2* 1 2 3 4 5 KRATON G 10 1645M L-MODU S-400 32 35 23 17 35 VISTAMAXX6202 8 5 10 11 ESCOREZ 5400 34.8 34.8 39.8 39.8 34.8 CALSOL 550 20 20 2225 15 EPOLENE N-21 3 3 3 5 3 IRGANOX 1076 0.2 0.2 0.2 0.2 0.2COEXTRUSION 2 2 2 2 2 COATING Molten Viscosity at 3150 4800 6825 46506400 4500 8075 150degC (cps) Initial Gardner 3 2 1 1 1 1 1 Color ThermalStability −25% +15%  +7.3% +14.0% +6.5%  +4.4% +18.3 (% change inviscosity) Static Peel 201 72 89 124 67 39 108 (seconds) Static Peel (%+23.6% +72.2% −6.9% −45.8% +50.0% increase versus NW1137)

The adhesive compositions of Examples 1-4 were prepared by combining andmixing the components in the percentages set forth in Table 2 in a sigmablade mixer operating at 177 ° C.

The adhesive composition of Example 5 was prepared in an appropriatesized batch by placing the correct ratios of all components except forthe polymers in a can, in an oven at a temperature of 177° C. until theingredients are molten. Once the composition is molten, the can isplaced in a heating mantle (e.g. Glas-Col, Terre Haute, Ind.), whichmaintains the temperature of the composition at around 150° C., and thecomposition is mixed with an upright mixer (e.g. Stirrer Type RZRI mixer(Caframo, Wiarton, Ontario, Canada)) while the polmers are slowly added.Mixing is continued until the polymers have been completely added and asmooth and homogeneous molten composition is achieved.

The coextrusion coating contains the following in the stated weightpercentages:

ESCOREZ 5415—Exxon Mobil Chemical Company (Houston, Tex.) 34.8%

KRATON G1652—Kraton Performance Polymers Inc. (Houston, Tex.) 25%

SHELL MICROWAX HMP—Shell Deutschland Oil GmbH 39.6%

IRGANOX 1072 0.6%

-   -   Comparative 1 is HL1358LO is an SIS (styrene-isoprene-styrene)        based hot melt adhesive commercially available from HB Fuller        Company    -   Comparative 2 is NW1137 is an ethylene-octene based hot melt        adhesive commercially available from HB Fuller Company

Example 5 was tested according to the Elastic Attachment Creep Test. Avalue of 4-5% was obtained.

Other embodiments are within the claims.

What is claimed is:
 1. A disposable absorbent article selected from thegroup consisting of an adult incontinence product and a diapercomprising: a first substrate and an elastic material; and an adhesivecomposition comprising: a first polymer that is propylene-based and hasa Mw of no greater than about 75,000 and; a second polymer selected froma group consisting of propylene based polymers with a Mw of at leastabout 100,000 and styrene block copolymers with a styrene content of nogreater than about 20%, wherein the propylene-based polymers have apolydispersity index of less than about 5 and wherein the adhesivecomposition is in contact with the elastic material and the firstsubstrate.
 2. The disposable absorbent article of claim 1 wherein theadhesive composition also is applied in at least one additionalapplication selected from the group consisting of core stabilization andconstruction.
 3. The disposable absorbent article of claim 1 wherein theadhesive composition also is applied as a core stabilization adhesiveand construction adhesive.
 4. The article of claim 1 wherein theadhesive composition comprises no greater than about 20% by weightplasticizer.
 5. The article of claim 1 wherein the adhesive compositioncomprises no greater than about 18% by weight plasticizer.
 6. Thearticle of claim I wherein said second polymer is present at from about2% to about 15% by weight.
 7. The article of claim 1 wherein the saidsecond polymer has a Mw of at least about 150,000.
 8. The article ofclaim 1 wherein the first polymer is a propylene homopolymer.
 9. Thearticle of claim 1 wherein the first polymer is a propylene copolymer.10. The article of claim 1 wherein the first polymer is present atgreater than about 25% by weight.
 11. The article of claim 1 wherein thesecond polymer is a hydrogenated styrene block copolymer.
 12. Thearticle of claim 1 wherein the second polymer is said propylene-basedpolymer.
 13. The article of claim 1 wherein the adhesive compositioncomprises at least about 35% total polymer.
 14. The article of claim 11wherein the styrene block copolymer additionally has a Melt Flow whentested according to ASTM 1238 (230° C., 5 kg) of no greater than about 5g/10 min.
 15. The disposable absorbent article of claim 1 wherein saiddisposable absorbent article is selected from the group consisting of anadult incontinence product and a diaper.
 16. The disposable absorbentarticle of claim 1 wherein said disposable absorbent article is adiaper.
 17. The disposable absorbent article of claim 1 wherein theadhesive composition bonds the elastic material to the first substrateresulting in creep resistant gathers.
 18. A hot melt adhesivecomposition comprising: a first polymer that is propylene-based and hasa Mw of no greater than about 75,000 and a polydispersity index of lessthan about 5 and; a second polymer that is a hydrogenated styrene blockcopolymer with a styrene content of no greater than about 20%, and aMelt Flow when tested according to ASTM 1238 (230° C., 5kg) of nogreater than about 25 g/10 min; wherein the adhesive compositioncontains no greater than 18% by weight plasticizer.
 19. The hot meltadhesive composition of claim 18 wherein the total polymer content is atleast about 35% by weight.
 20. The hot melt adhesive of claim 18 havinga creep of no greater than about 6% when tested according to the ElasticAttachment Creep Test.